Disclosures About Fair Value of Assets and Liabilities (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Schedule of fair value transfer among levels
Reason for Transfer (a)	Valuation determined by widely accepted techniques including discounted cash flow analysis on expected cash flows of each derivative and observable market rate inputs such as yield curves and contractual terms on each instrument
Reason for Transfer (b)	Valuation determined by quoted prices for similar loans in the secondary market with an expected fallout rate (interest rate locked pipeline loans not expected to close). Fallout rate is not considered a significant input to the fair value in its entirety
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Significant Other Observable Inputs (Level 2) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3	67,920
Significant Unobservable Inputs (Level 3) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Hedged loans [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3	(59,911)
Hedged loans [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Hedged loans [Member] | Significant Other Observable Inputs (Level 2) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3	74,947
Hedged loans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Forward sale commitments [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3	(510)
Forward sale commitments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Forward sale commitments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3	942
Forward sale commitments [Member] | Significant Unobservable Inputs (Level 3) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Interest rate swap agreements [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3	6,464
Interest rate swap agreements [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Interest rate swap agreements [Member] | Significant Other Observable Inputs (Level 2) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3	(7,969)
Interest rate swap agreements [Member] | Significant Unobservable Inputs (Level 3) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Commitment to originate loan [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3	71
Commitment to originate loan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Commitment to originate loan [Member] | Significant Other Observable Inputs (Level 2) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3
Commitment to originate loan [Member] | Significant Unobservable Inputs (Level 3) [Member]
Schedule of fair value transfer among levels
Transfers between Levels 1, 2 and 3